-/* $Id: http.c,v 1.28 2007-04-19 16:07:20 adam Exp $
- Copyright (c) 2006-2007, Index Data.
-
-This file is part of Pazpar2.
+/* This file is part of Pazpar2.
+ Copyright (C) 2006-2008 Index Data
Pazpar2 is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
for more details.
You should have received a copy of the GNU General Public License
-along with Pazpar2; see the file LICENSE. If not, write to the
-Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.
- */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+*/
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
+#include <yaz/snprintf.h>
#include <unistd.h>
#include <stdlib.h>
#include <strings.h>
#include <yaz/comstack.h>
#include <yaz/nmem.h>
-#include "cconfig.h"
#include "util.h"
#include "eventl.h"
#include "pazpar2.h"
#include "http.h"
#include "http_command.h"
+#define MAX_HTTP_HEADER 4096
+
static void proxy_io(IOCHAN i, int event);
static struct http_channel *http_create(const char *addr);
static void http_destroy(IOCHAN i);
static struct http_buf *http_buf_freelist = 0;
static struct http_channel *http_channel_freelist = 0;
+struct http_channel_observer_s {
+ void *data;
+ void *data2;
+ http_channel_destroy_t destroy;
+ struct http_channel_observer_s *next;
+ struct http_channel *chan;
+};
+
+
+static const char *http_lookup_header(struct http_header *header,
+ const char *name)
+{
+ for (; header; header = header->next)
+ if (!strcasecmp(name, header->name))
+ return header->value;
+ return 0;
+}
+
static struct http_buf *http_buf_create()
{
struct http_buf *r;
}
}
-#ifdef GAGA
-// Calculate length of chain
-static int http_buf_len(struct http_buf *b)
-{
- int sum = 0;
- for (; b; b = b->next)
- sum += b->len;
- return sum;
-}
-#endif
-
static struct http_buf *http_buf_bybuf(char *b, int len)
{
struct http_buf *res = 0;
// Non-destructively collapse chain of buffers into a string (max *len)
// Return
-static int http_buf_peek(struct http_buf *b, char *buf, int len)
+static void http_buf_peek(struct http_buf *b, char *buf, int len)
{
int rd = 0;
while (b && rd < len)
b = b->next;
}
buf[rd] = '\0';
- return rd;
+}
+
+static int http_buf_size(struct http_buf *b)
+{
+ int sz = 0;
+ for (; b; b = b->next)
+ sz += b->len;
+ return sz;
}
// Ddestructively munch up to len from head of queue.
r->channel = c;
r->headers = 0;
r->payload = 0;
+ r->content_type = "text/xml";
return r;
}
+
+static const char *next_crlf(const char *cp, size_t *skipped)
+{
+ const char *next_cp = strchr(cp, '\n');
+ if (next_cp)
+ {
+ if (next_cp > cp && next_cp[-1] == '\r')
+ *skipped = next_cp - cp - 1;
+ else
+ *skipped = next_cp - cp;
+ next_cp++;
+ }
+ return next_cp;
+}
+
// Check if buf contains a package (minus payload)
-static int package_check(const char *buf)
+static int package_check(const char *buf, int sz)
{
+ int content_len = 0;
int len = 0;
- while (*buf) // Check if we have a sequence of lines terminated by an empty line
+
+ while (*buf)
{
- char *b = strstr(buf, "\r\n");
+ size_t skipped = 0;
+ const char *b = next_crlf(buf, &skipped);
if (!b)
- return 0;
-
- len += (b - buf) + 2;
- if (b == buf)
- return len;
- buf = b + 2;
+ {
+ // we did not find CRLF.. See if buffer is too large..
+ if (sz >= MAX_HTTP_HEADER-1)
+ return MAX_HTTP_HEADER-1; // yes. Return that (will fail later)
+ break;
+ }
+ len += (b - buf);
+ if (skipped == 0)
+ {
+ // CRLF CRLF , i.e. end of header
+ if (len + content_len <= sz)
+ return len + content_len;
+ break;
+ }
+ buf = b;
+ // following first skip of \r\n so that we don't consider Method
+ if (!strncasecmp(buf, "Content-Length:", 15))
+ {
+ const char *cp = buf+15;
+ while (*cp == ' ')
+ cp++;
+ content_len = 0;
+ while (*cp && isdigit(*cp))
+ content_len = content_len*10 + (*cp++ - '0');
+ if (content_len < 0) /* prevent negative offsets */
+ content_len = 0;
+ }
}
- return 0;
+ return 0; // incomplete request
}
// Check if we have a request. Return 0 or length
-// (including trailing CRNL) FIXME: Does not deal gracefully with requests
-// carrying payload but this is kind of OK since we will reject anything
-// other than an empty GET
static int request_check(struct http_buf *queue)
{
- char tmp[4096];
+ char tmp[MAX_HTTP_HEADER];
- http_buf_peek(queue, tmp, 4096);
- return package_check(tmp);
+ // only peek at the header..
+ http_buf_peek(queue, tmp, MAX_HTTP_HEADER-1);
+ // still we only return non-zero if the complete request is received..
+ return package_check(tmp, http_buf_size(queue));
}
struct http_response *http_parse_response_buf(struct http_channel *c, const char *buf, int len)
{
- char tmp[4096];
+ char tmp[MAX_HTTP_HEADER];
struct http_response *r = http_create_response(c);
char *p, *p2;
struct http_header **hp = &r->headers;
- if (len >= 4096)
+ if (len >= MAX_HTTP_HEADER)
return 0;
memcpy(tmp, buf, len);
for (p = tmp; *p && *p != ' '; p++) // Skip HTTP version
return r;
}
-struct http_request *http_parse_request(struct http_channel *c, struct http_buf **queue,
- int len)
+static int http_parse_arguments(struct http_request *r, NMEM nmem,
+ const char *args)
+{
+ const char *p2 = args;
+
+ while (*p2)
+ {
+ struct http_argument *a;
+ const char *equal = strchr(p2, '=');
+ const char *eoa = strchr(p2, '&');
+ if (!equal)
+ {
+ yaz_log(YLOG_WARN, "Expected '=' in argument");
+ return -1;
+ }
+ if (!eoa)
+ eoa = equal + strlen(equal); // last argument
+ else if (equal > eoa)
+ {
+ yaz_log(YLOG_WARN, "Missing '&' in argument");
+ return -1;
+ }
+ a = nmem_malloc(nmem, sizeof(struct http_argument));
+ a->name = nmem_strdupn(nmem, p2, equal - p2);
+ a->value = nmem_strdupn(nmem, equal+1, eoa - equal - 1);
+ urldecode(a->name, a->name);
+ urldecode(a->value, a->value);
+ a->next = r->arguments;
+ r->arguments = a;
+ p2 = eoa;
+ while (*p2 == '&')
+ p2++;
+ }
+ return 0;
+}
+
+struct http_request *http_parse_request(struct http_channel *c,
+ struct http_buf **queue,
+ int len)
{
struct http_request *r = nmem_malloc(c->nmem, sizeof(*r));
char *p, *p2;
- char tmp[4096];
- char *buf = tmp;
+ char *start = nmem_malloc(c->nmem, len+1);
+ char *buf = start;
- if (len > 4096)
- return 0;
if (http_buf_read(queue, buf, len) < len)
+ {
+ yaz_log(YLOG_WARN, "http_buf_read < len (%d)", len);
return 0;
-
+ }
r->search = "";
r->channel = c;
r->arguments = 0;
r->headers = 0;
+ r->content_buf = 0;
+ r->content_len = 0;
// Parse first line
for (p = buf, p2 = r->method; *p && *p != ' ' && p - buf < 19; p++)
*(p2++) = *p;
if (!(buf = strchr(buf, ' ')))
{
- yaz_log(YLOG_WARN, "Syntax error in request (1)");
+ yaz_log(YLOG_WARN, "Missing Request-URI in HTTP request");
return 0;
}
buf++;
if (!(p = strchr(buf, ' ')))
{
- yaz_log(YLOG_WARN, "Syntax error in request (2)");
+ yaz_log(YLOG_WARN, "HTTP Request-URI not terminated (too long?)");
return 0;
}
*(p++) = '\0';
{
r->search = nmem_strdup(c->nmem, p2);
// Parse Arguments
- while (*p2)
- {
- struct http_argument *a;
- char *equal = strchr(p2, '=');
- char *eoa = strchr(p2, '&');
- if (!equal)
- {
- yaz_log(YLOG_WARN, "Expected '=' in argument");
- return 0;
- }
- if (!eoa)
- eoa = equal + strlen(equal); // last argument
- else
- *(eoa++) = '\0';
- a = nmem_malloc(c->nmem, sizeof(struct http_argument));
- *(equal++) = '\0';
- a->name = nmem_strdup(c->nmem, p2);
- urldecode(equal, equal);
- a->value = nmem_strdup(c->nmem, equal);
- a->next = r->arguments;
- r->arguments = a;
- p2 = eoa;
- }
+ http_parse_arguments(r, c->nmem, p2);
}
buf = p;
strcpy(r->http_version, "1.0");
else
{
- buf += 5;
- if (!(p = strstr(buf, "\r\n")))
+ size_t skipped;
+ buf += 5; // strlen("HTTP/")
+
+ p = (char*) next_crlf(buf, &skipped);
+ if (!p || skipped < 3 || skipped > 5)
return 0;
- *(p++) = '\0';
- p++;
- strcpy(r->http_version, buf);
+
+ memcpy(r->http_version, buf, skipped);
+ r->http_version[skipped] = '\0';
buf = p;
}
strcpy(c->version, r->http_version);
r->headers = 0;
while (*buf)
{
- if (!(p = strstr(buf, "\r\n")))
+ size_t skipped;
+
+ p = (char *) next_crlf(buf, &skipped);
+ if (!p)
+ {
return 0;
- if (p == buf)
+ }
+ else if (skipped == 0)
+ {
+ buf = p;
break;
+ }
else
{
+ char *cp;
+ char *n_v = nmem_malloc(c->nmem, skipped+1);
struct http_header *h = nmem_malloc(c->nmem, sizeof(*h));
- if (!(p2 = strchr(buf, ':')))
+
+ memcpy(n_v, buf, skipped);
+ n_v[skipped] = '\0';
+
+ if (!(cp = strchr(n_v, ':')))
return 0;
- *(p2++) = '\0';
- h->name = nmem_strdup(c->nmem, buf);
- while (isspace(*p2))
- p2++;
- if (p2 >= p) // Empty header?
- {
- buf = p + 2;
- continue;
- }
- *p = '\0';
- h->value = nmem_strdup(c->nmem, p2);
+ h->name = nmem_strdupn(c->nmem, n_v, cp - n_v);
+ cp++;
+ while (isspace(*cp))
+ cp++;
+ h->value = nmem_strdup(c->nmem, cp);
h->next = r->headers;
r->headers = h;
- buf = p + 2;
+ buf = p;
}
}
+ // determine if we do keep alive
+ if (!strcmp(c->version, "1.0"))
+ {
+ const char *v = http_lookup_header(r->headers, "Connection");
+ if (v && !strcmp(v, "Keep-Alive"))
+ c->keep_alive = 1;
+ else
+ c->keep_alive = 0;
+ }
+ else
+ {
+ const char *v = http_lookup_header(r->headers, "Connection");
+ if (v && !strcmp(v, "close"))
+ c->keep_alive = 0;
+ else
+ c->keep_alive = 1;
+ }
+ if (buf < start + len)
+ {
+ const char *content_type = http_lookup_header(r->headers,
+ "Content-Type");
+ r->content_len = start + len - buf;
+ r->content_buf = buf;
+
+ if (!strcmp(content_type, "application/x-www-form-urlencoded"))
+ {
+ http_parse_arguments(r, c->nmem, r->content_buf);
+ }
+ }
return r;
}
struct http_header *h;
wrbuf_rewind(c->wrbuf);
- wrbuf_printf(c->wrbuf, "HTTP/1.1 %s %s\r\n", r->code, r->msg);
+ wrbuf_printf(c->wrbuf, "HTTP/%s %s %s\r\n", c->version, r->code, r->msg);
for (h = r->headers; h; h = h->next)
wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
if (r->payload)
{
- wrbuf_printf(c->wrbuf, "Content-length: %d\r\n", r->payload ?
+ wrbuf_printf(c->wrbuf, "Content-Length: %d\r\n", r->payload ?
(int) strlen(r->payload) : 0);
- wrbuf_printf(c->wrbuf, "Content-type: text/xml\r\n");
+ wrbuf_printf(c->wrbuf, "Content-Type: %s\r\n", r->content_type);
+ if (!strcmp(r->content_type, "text/xml"))
+ {
+ xmlDoc *doc = xmlParseMemory(r->payload, strlen(r->payload));
+ if (doc)
+ {
+ xmlFreeDoc(doc);
+ }
+ else
+ {
+ yaz_log(YLOG_WARN, "Sending non-wellformed "
+ "response (bug #1162");
+ yaz_log(YLOG_WARN, "payload: %s", r->payload);
+ }
+ }
}
wrbuf_puts(c->wrbuf, "\r\n");
{
struct http_channel *c = r->channel;
struct http_header *h;
- struct http_argument *a;
wrbuf_rewind(c->wrbuf);
- wrbuf_printf(c->wrbuf, "%s %s", r->method, r->path);
-
- if (r->arguments)
- {
- wrbuf_putc(c->wrbuf, '?');
- for (a = r->arguments; a; a = a->next) {
- if (a != r->arguments)
- wrbuf_putc(c->wrbuf, '&');
- wrbuf_printf(c->wrbuf, "%s=%s", a->name, a->value);
- }
- }
+ wrbuf_printf(c->wrbuf, "%s %s%s%s", r->method, r->path,
+ *r->search ? "?" : "", r->search);
wrbuf_printf(c->wrbuf, " HTTP/%s\r\n", r->http_version);
wrbuf_printf(c->wrbuf, "%s: %s\r\n", h->name, h->value);
wrbuf_puts(c->wrbuf, "\r\n");
-
+
+ if (r->content_buf)
+ wrbuf_write(c->wrbuf, r->content_buf, r->content_len);
+
+#if 0
+ yaz_log(YLOG_LOG, "WRITING TO PROXY:\n%s\n----",
+ wrbuf_cstr(c->wrbuf));
+#endif
return http_buf_bywrbuf(c->wrbuf);
}
}
// Do _not_ modify Host: header, just checking it's existence
- for (hp = rq->headers; hp; hp = hp->next)
- if (!strcmp(hp->name, "Host"))
- break;
- if (!hp)
+
+ if (!http_lookup_header(rq->headers, "Host"))
{
yaz_log(YLOG_WARN, "Failed to find Host header in proxy");
return -1;
}
requestbuf = http_serialize_request(rq);
+
http_buf_enqueue(&p->oqueue, requestbuf);
iochan_setflag(p->iochan, EVENT_OUTPUT);
return 0;
}
}
+static void http_error(struct http_channel *hc, int no, const char *msg)
+{
+ struct http_response *rs = http_create_response(hc);
+
+ hc->response = rs;
+ hc->keep_alive = 0; // not keeping this HTTP session alive
+
+ sprintf(rs->code, "%d", no);
+
+ rs->msg = nmem_strdup(hc->nmem, msg);
+ rs->payload = nmem_malloc(hc->nmem, 100);
+ yaz_snprintf(rs->payload, 99, "<error>HTTP Error %d: %s</error>\n",
+ no, msg);
+ http_send_response(hc);
+}
+
static void http_io(IOCHAN i, int event)
{
struct http_channel *hc = iochan_getdata(i);
http_destroy(i);
return;
}
- if (res > 0)
- {
- htbuf->buf[res] = '\0';
- htbuf->len = res;
- http_buf_enqueue(&hc->iqueue, htbuf);
- }
-
- if (hc->state == Http_Busy)
- return;
- if ((reqlen = request_check(hc->iqueue)) <= 2)
- return;
+ htbuf->buf[res] = '\0';
+ htbuf->len = res;
+ http_buf_enqueue(&hc->iqueue, htbuf);
- nmem_reset(hc->nmem);
- if (!(hc->request = http_parse_request(hc, &hc->iqueue, reqlen)))
- {
- yaz_log(YLOG_WARN, "Failed to parse request");
- http_destroy(i);
- return;
- }
- hc->response = 0;
- yaz_log(YLOG_LOG, "Request: %s %s%s%s", hc->request->method,
- hc->request->path,
- *hc->request->search ? "?" : "",
- hc->request->search);
- if (http_weshouldproxy(hc->request))
- http_proxy(hc->request);
- else
- {
- // Execute our business logic!
- hc->state = Http_Busy;
- http_command(hc);
- }
- if (hc->iqueue)
+ while (1)
{
- yaz_log(YLOG_DEBUG, "We think we have more input to read. Forcing event");
- iochan_setevent(i, EVENT_INPUT);
+ if (hc->state == Http_Busy)
+ return;
+ reqlen = request_check(hc->iqueue);
+ if (reqlen <= 2)
+ return;
+ // we have a complete HTTP request
+ nmem_reset(hc->nmem);
+ if (!(hc->request = http_parse_request(hc, &hc->iqueue, reqlen)))
+ {
+ yaz_log(YLOG_WARN, "Failed to parse request");
+ http_error(hc, 400, "Bad Request");
+ return;
+ }
+ hc->response = 0;
+ yaz_log(YLOG_LOG, "Request: %s %s%s%s", hc->request->method,
+ hc->request->path,
+ *hc->request->search ? "?" : "",
+ hc->request->search);
+ if (http_weshouldproxy(hc->request))
+ http_proxy(hc->request);
+ else
+ {
+ // Execute our business logic!
+ hc->state = Http_Busy;
+ http_command(hc);
+ }
}
-
break;
-
case EVENT_OUTPUT:
if (hc->oqueue)
{
wb->offset += res;
}
if (!hc->oqueue) {
- if (!strcmp(hc->version, "1.0"))
+ if (!hc->keep_alive)
{
http_destroy(i);
return;
}
}
-#ifdef GAGA
-// If this hostname contains our proxy host as a prefix, replace with myurl
-static char *sub_hostname(struct http_channel *c, char *buf)
-{
- char tmp[1024];
- if (strlen(buf) > 1023)
- return buf;
- if (strncmp(buf, "http://", 7))
- return buf;
- if (!strncmp(buf + 7, proxy_url, strlen(proxy_url)))
- {
- strcpy(tmp, myurl);
- strcat(tmp, buf + strlen(proxy_url) + 7);
- return nmem_strdup(c->nmem, tmp);
- }
- return buf;
-}
-#endif
-
// Handles I/O on a client connection to a backend web server (proxy mode)
static void proxy_io(IOCHAN pi, int event)
{
htbuf->buf[res] = '\0';
htbuf->offset = 0;
htbuf->len = res;
-#ifdef GAGA
- if (pc->first_response) // Check if this is a redirect
- {
- int len;
- if ((len = package_check(htbuf->buf)))
- {
- struct http_response *res = http_parse_response_buf(hc, htbuf->buf, len);
- if (res)
- {
- struct http_header *h;
- for (h = res->headers; h; h = h->next)
- if (!strcmp(h->name, "Location"))
- {
- // We found a location header. Rewrite it.
- struct http_buf *buf;
- h->value = sub_hostname(hc, h->value);
- buf = http_serialize_response(hc, res);
- yaz_log(YLOG_LOG, "Proxy rewrite");
- http_buf_enqueue(&hc->oqueue, buf);
- htbuf->offset = len;
- break;
- }
- }
- }
- pc->first_response = 0;
- }
-#endif
// Write any remaining payload
if (htbuf->len - htbuf->offset > 0)
http_buf_enqueue(&hc->oqueue, htbuf);
}
}
+static void http_fire_observers(struct http_channel *c);
+static void http_destroy_observers(struct http_channel *c);
+
// Cleanup channel
static void http_destroy(IOCHAN i)
{
http_buf_destroy_queue(s->proxy->oqueue);
xfree(s->proxy);
}
+ http_buf_destroy_queue(s->iqueue);
+ http_buf_destroy_queue(s->oqueue);
+ http_fire_observers(s);
+ http_destroy_observers(s);
s->next = http_channel_freelist;
http_channel_freelist = s;
close(iochan_getfd(i));
r->iochan = 0;
r->iqueue = r->oqueue = 0;
r->state = Http_Idle;
+ r->keep_alive = 0;
r->request = 0;
r->response = 0;
if (!addr)
exit(1);
}
strcpy(r->addr, addr);
+ r->observers = 0;
return r;
}
strncpy(hostname, addr, len);
hostname[len] = '\0';
- if (!(he = gethostbyname(hostname)))
- {
+ if (!(he = gethostbyname(hostname))){
yaz_log(YLOG_FATAL, "Unable to resolve '%s'", hostname);
exit(1);
}
memcpy(&myaddr.sin_addr.s_addr, he->h_addr_list[0], he->h_length);
port = atoi(pp + 1);
-
- yaz_log(YLOG_LOG, "HTTP address %s:%d",
- "" == he->h_addr_list[0] ? he->h_addr_list[0] : "127.0.0.1" ,
- port);
-
}
else
{
abort();
if (bind(l, (struct sockaddr *) &myaddr, sizeof myaddr) < 0)
+ {
yaz_log(YLOG_FATAL|YLOG_ERRNO, "bind");
+ exit(1);
+ }
if (listen(l, SOMAXCONN) < 0)
+ {
yaz_log(YLOG_FATAL|YLOG_ERRNO, "listen");
+ exit(1);
+ }
c = iochan_create(l, http_accept, EVENT_INPUT | EVENT_EXCEPT);
pazpar2_add_channel(c);
proxy_addr->sin_port = htons(port);
}
+static void http_fire_observers(struct http_channel *c)
+{
+ http_channel_observer_t p = c->observers;
+ while (p)
+ {
+ p->destroy(p->data, c, p->data2);
+ p = p->next;
+ }
+}
+
+static void http_destroy_observers(struct http_channel *c)
+{
+ while (c->observers)
+ {
+ http_channel_observer_t obs = c->observers;
+ c->observers = obs->next;
+ xfree(obs);
+ }
+}
+
+http_channel_observer_t http_add_observer(struct http_channel *c, void *data,
+ http_channel_destroy_t des)
+{
+ http_channel_observer_t obs = xmalloc(sizeof(*obs));
+ obs->chan = c;
+ obs->data = data;
+ obs->data2 = 0;
+ obs->destroy= des;
+ obs->next = c->observers;
+ c->observers = obs;
+ return obs;
+}
+
+void http_remove_observer(http_channel_observer_t obs)
+{
+ struct http_channel *c = obs->chan;
+ http_channel_observer_t found, *p = &c->observers;
+ while (*p != obs)
+ p = &(*p)->next;
+ found = *p;
+ assert(found);
+ *p = (*p)->next;
+ xfree(found);
+}
+
+struct http_channel *http_channel_observer_chan(http_channel_observer_t obs)
+{
+ return obs->chan;
+}
+
+void http_observer_set_data2(http_channel_observer_t obs, void *data2)
+{
+ obs->data2 = data2;
+}
+
+
/*
* Local variables:
* c-basic-offset: 4
projects / pazpar2-moved-to-github.git / blobdiff